US4511539A - Recovery of precious metal - Google Patents

Recovery of precious metal Download PDF

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Publication number
US4511539A
US4511539A US06/590,546 US59054684A US4511539A US 4511539 A US4511539 A US 4511539A US 59054684 A US59054684 A US 59054684A US 4511539 A US4511539 A US 4511539A
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United States
Prior art keywords
fibres
getter according
agglomeration
getter
gold
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Expired - Fee Related
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US06/590,546
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English (en)
Inventor
David J. Stephenson
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Johnson Matthey PLC
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Johnson Matthey PLC
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/009—General processes for recovering metals or metallic compounds from spent catalysts
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00—Obtaining noble metals
    • C22B11/02—Obtaining noble metals by dry processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00—Obtaining noble metals
    • C22B11/02—Obtaining noble metals by dry processes
    • C22B11/021—Recovery of noble metals from waste materials
    • C22B11/026—Recovery of noble metals from waste materials from spent catalysts
    • C22B11/028—Recovery of noble metals from waste materials from spent catalysts using solid sorbents, e.g. getters or catchment gauzes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to the recovery of precious metal lost from precious metal-containing catalysts for example the precious metal-containing catalysts which are used in the production of nitric acid by ammonia oxidation.
  • particles of platinum are retained only on the filter surface by mechanical lodgement and can be lost due to vibration of the plant or changes in the gas flow, and
  • gauzes means that the mechanical properties of the material are a significant factor. This restricts the range of compositions which may be used.
  • a getter for recovery of precious metal lost from a precious metal-containing catalyst operating at elevated temperature comprises an agglomeration or assemblage of unwoven fibres made from a metal selected from the group ruthenium, palladium, iridium, platinum, gold, silver, rhodium and alloys containing one or more or the said metals.
  • the unwoven fibres are randomly oriented.
  • a process for the recovery of precious metal lost from a precious metal-containing catalyst operating at elevated temperature comprises contacting reacting gases after their passage through the said catalyst with an agglomeration or assemblage of unwoven, preferably randomly oriented, fibres made from a metal selected from the group ruthenium, rhodium, palladium, iridium, platinum, gold, silver and alloys containing one or more of the said metals.
  • elevated temperature is meant a temperature greater than 250° C.
  • the said agglomeration or assemblage is preferably placed downstream of the said precious metal catalyst (considered in relation to the direction of flow of the reacting gases) but nevertheless in close proximity thereto.
  • the fibres are preferably relatively short filaments (in this context, by short we mean short when compared with the length of the wires used in the construction of conventional getter gauzes) which may be of generally circular or non-circular for example rectangular (i.e., of ribbon form) and "D" or semi-circular cross section. Where the fibres are of "D" cross-sectional shape, the major dimension falls within the range 0.004-0.006 inch and the minimum dimension falls within the range 0.002 to 0.005 inch.
  • the cross-sectional shape of the fibres is non-circular.
  • the mixture of air and ammonia may be passed through the catalyst at pressures in excess of 100 p.s.i. and at temperatures of between 650° C. and 1000° C.
  • a getter according to the present invention is used in a reactor at such temperatures and pressures, it is preferably supported, at least downstream (when considered in the direction of flow of the reactants), by one or more conventional gauzes which may be made from a platinum group metal, an alloy containing at least one platinum group metal or made from an alloy stable at high temperatures such as a Kanthal (Registered Trade Mark).
  • Kanthal is an aluminum-chromium-iron alloy which in weight percent, consists essentially of chromium (22.0%), aluminum (4.5%), cobalt (up to 2%), balance iron with minor amounts of sulphur, phosphorus, manganese, magnesium, etc.
  • the agglomeration or assemblage of fibres is sandwiched between one or more layers of conventional gauze as mentioned above. According to a practical embodiment of the invention in the manufacture of nitric acid, the agglomerate or assemblage of fibres is disposed in close proximity to the catalyst zone.
  • One or more gauzes support the agglomeration or assemblage from below and optionally one or more containing gauzes disposed above the agglomeration or assemblage, the said gauzes being made from a platinum group metal, an alloy stable at high temperature such as a Kanthal (RTM) or an alloy containing at least one platinum group metal.
  • the fibres of the agglomeration are made from palladium or a palladium-gold alloy.
  • the fibres in the agglomeration may be welded, e.g. by laser techniques in order to produce a self supporting unit. Generally speaking, however, in use the fibres are bonded together by sintering.
  • the getter according to the invention includes a first agglomeration of fibres sandwiched between first and second layers comprising at least one support gauze and a second agglomeration of fibres sandwiched between the said second layer and a third layer comprising at least one support gauze.
  • a third agglomeration of fibres is sandwiched between the said third layer and a fourth layer comprising at least one support gauze.
  • the first layer is conveniently a catalyst, for example a 90 Pt/5 Rh/5 Au. alloy, and the total weight of the fibres constitutes up to 50% of the weight of the catalyst.
  • the first agglomerate constitutes up to 50 wt% of the total weight of the fibres and second and third agglomerates each constitute up to 25 wt% of total weight of the fibres.
  • the thickness of a pad of getter fibres is selected to be appropriate to the operating conditions of the nitric acid plant in which it is to be used.
  • Various combinations of gauze layers with fibrous product agglomerates therebetween of various thicknesses can obviously be designed for various applications or plant parameters depending on prevailing plant conditions. Indeed by methods to be described below the supporting gauzes may be dispensed with entirely, especially if the fibres of the pad are bonded together e.g. laser welding, to give a strong self supporting assembly.
  • the conventional pack of getter gauzes in an ammonia oxidation plant may be with advantage substituted either partially or completely with the random fibre arrangement of this invention. Such substitution can be as a single layer or various multiple sandwich arrangements as possible.
  • the agglomeration of fibers is compressed to a density such that the agglomeration contains between 10 and 30 kg per square meter of agglomerate, for example, within the range of 15 to 20 kg per square meter of agglomerate.
  • a number of methods for the production of appropriate fibres from an alloy containing at least one of the said metals may be used in the operation of the present invention as outlined below.
  • Melt spinning in which fine metal jets or streams are rapidly solidifed on a rotating metal wheel, or the related process melt extraction may be used in the production of appropriate fibre, for example a palladium-gold alloy fibre.
  • the fibre produced by these methods is preferred in this invention and may be either in substantially continuous lengths, which is subsequently cut to required lengths, or may be prepared in shorter discrete lengths of staple fibre.
  • the length of fibre for use in the agglomerates which form part of the getter assemblies according to the present invention in conveniently within the range 1/2 to 4 inches and preferably within the range 1/2 to 2 inches.
  • Such fibres can be produced by melt extraction process (sometimes referred to as “melt spun” or “melt extraction” process) by the apparatus described in U.S. Pat. No. 3,904,344.
  • melt extraction process sometimes referred to as "melt spun” or “melt extraction” process
  • apparatus for producing fibres or filaments is described in U.S. Pat. Nos. 3,838,185 and 3,812,901.
  • a stream of molten metal or alloy is either allowed to solidify in free flight or is caused to solidify by contact with a so-called "chill-block".
  • This is a cooled body or a body of high thermal capacity or both and is generally in the form of a rotating wheel, disc or dish or a moving belt.
  • the stream of molten metal impinges on the body and is thrown off or removed therefrom as a continuous or discontinuous filament depending upon such parameters as the temperature and speed of the stream of molten metal or alloy as it impinges on the chill block and the surface speed of the chill block at the point of impingement.
  • any increase in the speed of impingement of the stream on the chill block will tend to cause the metal or alloy to pile up on the block so that the filament leaving it will increase in thickness.
  • the speed of impingement is progressively reduced, the tendency of the metal or alloy to pile up and the thickness of the resulting filament is also progressively reduced until the point is reached where the thinnest continuous filament possible at the particular temperature of the metal or alloy will be produced. Any further reduction in the speed of impingement will then result in the production of discontinuous filaments.
  • molten metal or alloy first forms a meniscus between a nozzle at the end of a feed tube from a crucible containing a static head of the molten metal or alloy and the curved surface of a cooled rotating body such as a drum.
  • the meniscus is partially solidified by contact the the body surface which drags away the solidifying metal or alloy to form a continuous filament.
  • Solidification is completed as the body rotates and the solidified filament, which may be in the form of a fibre, a filament or a strip, is removed from the body surface before it has executed a complete revolution and is then coiled.
  • Crimping of fibre by passing through toothed rollers is advantageous in yielding a material which knits or interwines more readily into a relatively rigid getter pad, and such crimping may be similarly advantageous to fibre produced by other processes.
  • the alloy fibres may be allowed to settle from a viscous liquid medium, the liquid being extracted via a porous substrate in a manner similar to paper-making processes.
  • the fibres may be distributed manually by hand over the required surface area, followed by lightly compressing into a pad of suitable thickness.
  • the fibres may be bonded into a pad with a heat decomposable adhesive or binder which oxidises away in the early stages of a run using the new pad. By this stage the fibres have sintered together to form an agglomerate which does not disintergrate.
  • Suitable adhesives which may be used for this purpose are ethylcellulose polymethylmethacrylate and polybutyl-methacrylate. To allow for easier handling the resulting pad may be converted into a more rigid assembly by stitching with platinum alloy wire. Stapling is a further possible method for achieving the same object. Spot welding at regular intervals or seam welding is also a successful method for partially binding the fibres together during the assembly stage.
  • Fibres of any composition may be easily produced and Au-Pd alloys having higher palladium concentrations e.g. 5% Au-Pd are much more efficient in their gettering action.
  • fibres allow the metal to be used more effectively.
  • the fibres have a higher surface area to weight ratio and hence greater efficiency than gauzes.
  • the fibre agglomerate or assemblage according to the invention has been found to give a performance at least equivalent to and generally better than that of conventional getter gauze packs in the manufacture of nitric acid. Further, use of the said agglomerates showed considerable metal saving compared with the use of standard getter gauzes. The use of fibres overcomes the tedious and expensive process of fine wire drawing and weaving.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Catalysts (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
  • Harvesting Machines For Specific Crops (AREA)
  • Food-Manufacturing Devices (AREA)
  • Treating Waste Gases (AREA)
  • Materials For Medical Uses (AREA)
  • Testing Of Coins (AREA)
US06/590,546 1981-04-10 1984-03-19 Recovery of precious metal Expired - Fee Related US4511539A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8111374 1981-04-10
GB8111374 1981-04-10

Related Parent Applications (1)

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US06367063 Continuation 1982-04-09

Publications (1)

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US4511539A true US4511539A (en) 1985-04-16

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US06/590,546 Expired - Fee Related US4511539A (en) 1981-04-10 1984-03-19 Recovery of precious metal

Country Status (15)

Country Link
US (1) US4511539A (de)
EP (1) EP0063450B1 (de)
JP (1) JPS5811751A (de)
AT (1) ATE15815T1 (de)
CA (1) CA1190913A (de)
DE (1) DE3266486D1 (de)
DK (1) DK163982A (de)
ES (1) ES8607415A1 (de)
FI (1) FI821269L (de)
GB (1) GB2096484B (de)
GR (1) GR76310B (de)
IE (1) IE53011B1 (de)
NO (1) NO821183L (de)
PT (1) PT74733B (de)
ZA (1) ZA822414B (de)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4655797A (en) * 1983-09-08 1987-04-07 Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung Fine screen and fine screen stack, their use and process for the manufacture of fine screens
US4675111A (en) * 1984-07-16 1987-06-23 Micro-Plate Inc. Solution waste treatment module
US4774069A (en) * 1985-06-28 1988-09-27 Johnson Matthey Public Limited Company Process for the manufacture of nitric oxide
US5160722A (en) * 1991-06-17 1992-11-03 Johnson Matthey, Inc. Low pressure drop, high surface area ammonia oxidation catalyst
US5356603A (en) * 1991-06-17 1994-10-18 Johnson Matthey Inc. Method for the production of hydrocyanic acid using a corrugated catalyst
US20060106248A1 (en) * 2004-11-12 2006-05-18 Monsanto Technology Llc Recovery of noble metals from aqueous process streams
US8575061B2 (en) 2010-11-11 2013-11-05 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US8575062B2 (en) 2010-11-11 2013-11-05 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US8586500B2 (en) 2010-11-11 2013-11-19 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US8658558B2 (en) 2010-11-11 2014-02-25 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US8703641B2 (en) 2010-11-11 2014-04-22 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US20150030521A1 (en) * 2012-03-05 2015-01-29 Basf Se Ammonia Oxidation Reactor With Internal Filter Element
US9168519B2 (en) 2010-11-11 2015-10-27 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US9199224B2 (en) 2012-09-05 2015-12-01 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalysts and method for making thereof
US10589389B2 (en) 2016-04-18 2020-03-17 Liquidmetal Coatings, Llc Apparatus and method for cooling a hard metal applied to the surface of a metal alloy substrate
EP4310210A1 (de) * 2022-07-19 2024-01-24 Yara International ASA System zur rückgewinnung von flüchtigen metallen und edelmetallen aus gestapelten silberhaltigen elementen
EP4310209A1 (de) * 2022-07-19 2024-01-24 Yara International ASA Verfahren zur rückgewinnung von flüchtigen pt oder pd und system dafür

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2559787B1 (fr) * 1984-02-22 1992-09-18 Louyot Comptoir Lyon Alemand Toile perfectionnee pour la recuperation de platine, notamment dans les usines de synthese d'acide nitrique et procede de fabrication et d'utilisation de ladite toile
GB8431364D0 (en) * 1984-12-12 1985-01-23 Johnson Matthey Plc Catchment packs
EP0216493A1 (de) * 1985-08-19 1987-04-01 Engelhard Corporation Platinrückgewinnung mittels Perforierungfesten Netzen
GB9302531D0 (en) * 1993-02-09 1993-03-24 Johnson Matthey Plc Improvements in pt recovery
GB0819094D0 (en) 2008-10-20 2008-11-26 Johnson Matthey Plc Catalyst containment unit
GB201002378D0 (en) 2010-02-12 2010-03-31 Johnson Matthey Plc Catalyst structures
AU2024289628A1 (en) 2023-07-06 2025-12-18 Yara International Asa System for recovering volatile pt and/or rh and method thereof
EP4682274A1 (de) 2024-07-17 2026-01-21 Yara International ASA System zur rückgewinnung von flüchtigem pt, pd und/oder rh und verfahren dafür
EP4715070A1 (de) 2024-09-23 2026-03-25 Yara International ASA System zur rückgewinnung von flüchtigem pd und verfahren dafür

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2730189A (en) * 1950-02-09 1956-01-10 Degussa Platinum recovery
US3127668A (en) * 1955-03-03 1964-04-07 Iit Res Inst High strength-variable porosity sintered metal fiber articles and method of making the same
US3434826A (en) * 1964-10-03 1969-03-25 Degussa Recovery of noble metals which are volatilized during catalytic reactions
US3627497A (en) * 1970-01-12 1971-12-14 Chemical Construction Corp Apparatus for catalytic ammonia oxidation
US3660024A (en) * 1970-09-11 1972-05-02 Engelhard Min & Chem Process for ammonia oxidation
US3776701A (en) * 1971-10-05 1973-12-04 Matthey Bishop Inc Catalyst supporting structure
US3865555A (en) * 1972-06-28 1975-02-11 Rheinstahl Ag Reactor for catalytic gas phase oxidation
US4351887A (en) * 1979-05-03 1982-09-28 Johnson, Matthey & Co., Limited Foldable metallic gauze pack and segment
US4412859A (en) * 1981-08-12 1983-11-01 Engelhard Corporation Method for recovering platinum in a nitric acid plant

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1483138C3 (de) * 1965-08-19 1974-10-24 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt Verfahren zur Wiedergewinnung des bei der Amoniakdruckverbrennung mittels Katalysatoren sich verflüchtigenden Edelmetalls
DE1919635A1 (de) * 1969-04-18 1970-11-05 Uhde Gmbh Friedrich Kontaktofen fuer die Gasoxydation mit Auffangeinrichtung fuer Edelmetalle
BE873096A (fr) * 1978-12-27 1979-04-17 Mennica Panstwowa Grille de recuperation des platinoides

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2730189A (en) * 1950-02-09 1956-01-10 Degussa Platinum recovery
US3127668A (en) * 1955-03-03 1964-04-07 Iit Res Inst High strength-variable porosity sintered metal fiber articles and method of making the same
US3434826A (en) * 1964-10-03 1969-03-25 Degussa Recovery of noble metals which are volatilized during catalytic reactions
US3627497A (en) * 1970-01-12 1971-12-14 Chemical Construction Corp Apparatus for catalytic ammonia oxidation
US3660024A (en) * 1970-09-11 1972-05-02 Engelhard Min & Chem Process for ammonia oxidation
US3776701A (en) * 1971-10-05 1973-12-04 Matthey Bishop Inc Catalyst supporting structure
US3865555A (en) * 1972-06-28 1975-02-11 Rheinstahl Ag Reactor for catalytic gas phase oxidation
US4351887A (en) * 1979-05-03 1982-09-28 Johnson, Matthey & Co., Limited Foldable metallic gauze pack and segment
US4412859A (en) * 1981-08-12 1983-11-01 Engelhard Corporation Method for recovering platinum in a nitric acid plant

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Nitric Acid Rolls On", in Chem. Eng., Jun. 29, 1970, pp. 24-25.
Nitric Acid Rolls On , in Chem. Eng. , Jun. 29, 1970, pp. 24 25. *

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4655797A (en) * 1983-09-08 1987-04-07 Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung Fine screen and fine screen stack, their use and process for the manufacture of fine screens
US4675111A (en) * 1984-07-16 1987-06-23 Micro-Plate Inc. Solution waste treatment module
US4774069A (en) * 1985-06-28 1988-09-27 Johnson Matthey Public Limited Company Process for the manufacture of nitric oxide
US5160722A (en) * 1991-06-17 1992-11-03 Johnson Matthey, Inc. Low pressure drop, high surface area ammonia oxidation catalyst
US5356603A (en) * 1991-06-17 1994-10-18 Johnson Matthey Inc. Method for the production of hydrocyanic acid using a corrugated catalyst
US7687663B2 (en) 2004-11-12 2010-03-30 Monsanto Technology Llc Recovery of noble metals from aqueous process streams
US20060106248A1 (en) * 2004-11-12 2006-05-18 Monsanto Technology Llc Recovery of noble metals from aqueous process streams
US9776181B2 (en) 2010-11-11 2017-10-03 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US8575061B2 (en) 2010-11-11 2013-11-05 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US8575062B2 (en) 2010-11-11 2013-11-05 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US8586500B2 (en) 2010-11-11 2013-11-19 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US8658558B2 (en) 2010-11-11 2014-02-25 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US8703641B2 (en) 2010-11-11 2014-04-22 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US9168519B2 (en) 2010-11-11 2015-10-27 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US20150030521A1 (en) * 2012-03-05 2015-01-29 Basf Se Ammonia Oxidation Reactor With Internal Filter Element
US9663366B2 (en) * 2012-03-05 2017-05-30 Basf Se Ammonia oxidation reactor with internal filter element
US9205413B2 (en) 2012-09-05 2015-12-08 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalysts and method for making thereof
US9266098B2 (en) 2012-09-05 2016-02-23 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalysts and method for making thereof
US9327274B2 (en) 2012-09-05 2016-05-03 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalyst and method for making thereof
US9327275B2 (en) 2012-09-05 2016-05-03 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalysts and method for making thereof
US9504993B2 (en) 2012-09-05 2016-11-29 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalysts and method for making thereof
US9199224B2 (en) 2012-09-05 2015-12-01 Chevron U.S.A. Inc. Hydroconversion multi-metallic catalysts and method for making thereof
US10589389B2 (en) 2016-04-18 2020-03-17 Liquidmetal Coatings, Llc Apparatus and method for cooling a hard metal applied to the surface of a metal alloy substrate
EP4310210A1 (de) * 2022-07-19 2024-01-24 Yara International ASA System zur rückgewinnung von flüchtigen metallen und edelmetallen aus gestapelten silberhaltigen elementen
EP4310209A1 (de) * 2022-07-19 2024-01-24 Yara International ASA Verfahren zur rückgewinnung von flüchtigen pt oder pd und system dafür
WO2024017929A1 (en) * 2022-07-19 2024-01-25 Yara International Asa Volatile and precious metal recovery system made of stacked silver-comprising elements
WO2024017928A1 (en) * 2022-07-19 2024-01-25 Yara International Asa Method for selectively recovering volatile pt or pd

Also Published As

Publication number Publication date
ZA822414B (en) 1983-03-30
FI821269A7 (fi) 1982-10-11
DE3266486D1 (en) 1985-11-07
EP0063450A1 (de) 1982-10-27
ES8607415A1 (es) 1986-06-01
GR76310B (de) 1984-08-04
PT74733B (en) 1983-11-09
DK163982A (da) 1982-10-11
IE53011B1 (en) 1988-05-11
CA1190913A (en) 1985-07-23
GB2096484A (en) 1982-10-20
IE820838L (en) 1982-10-10
FI821269L (fi) 1982-10-11
NO821183L (no) 1982-10-11
PT74733A (en) 1982-05-01
GB2096484B (en) 1985-03-13
ES511277A0 (es) 1986-06-01
FI821269A0 (fi) 1982-04-08
EP0063450B1 (de) 1985-09-25
JPS5811751A (ja) 1983-01-22
ATE15815T1 (de) 1985-10-15

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